Forc.toml metadata support

[zees-dev]

Description

Adds support for metadata as [project.metadata] or [workspace.metadata] in Forc.toml of value toml::Value

• Addresses: https://github.com/FuelLabs/rfcs/blob/22bf3936a37b60bb496232c1b52bf59e204a0697/text/rfcs/0006-metadata-in-forc-manifest.md#reference-level-explanation
• Resolves: Supporting external / 3rd-party plugin configuration in Forc.toml with a metadata table #2180

Linked examples of usage

• Rust and Typescript examples for forc-index Forc.toml metadata example-forc-plugins#1

[codspeed-hq]

CodSpeed Performance Report

Merging #6728 will not alter performance

_{Comparing feat/forc-toml-metadata-support (0452cdc) with master (9741809)}

Summary

✅ 22 untouched benchmarks

[kayagokalp]

Left a nit but otherwise LGTM 💯

[JoshuaBatty]

Nice one. It would be nice to add some documentation about this feature so developers of plugins are aware that this is now possible. I imagine you could put something together using the motivations already written in the RFC and #2180.

Adding it to the manifest reference probably makes the most sense https://docs.fuel.network/docs/forc/manifest_reference/

[sdankel]

LGTM, happy to approve once CI is passing

[sdankel]

🚀

[JoshuaBatty]

Nice work on this.